My cousin had a case of incorrect spelling of a tattoo. She got "Judged and Condemed to Burn" one of her friends wrote: "its a tramp stamp with a typo how can it get any worse" lol
One of my other friends was talking about Oprah but spelled it as Opera.. I made a joke about how he couldn't enjoy a good Opera and he didn't even get it.
Those are the best ones when they don't even realise they made a mistake.